Original vintage industrial magazine ad, for PITTSBURGH PLATE GLASS COMPANY of Pittsburgh, PA.  Columbia Chemical Division.  Record Volumes of Chlorine Shipped Via Waterways.  Fleets of chlorine barges have been transporting record quantities of chlorine from Columbia's plant at Natrium, WV. and from the plant of its affiliate, Southern Alkali Corporation at Lake Charles, LA.  Old 1948 industry advertisement.  (The scan shows a slight pink tint that is not on the actual ad.)

Approximate size  8 x 11 inches.